Date: Wed, 28 Feb 2001 05:07:12 -0800 From: Julian Elischer <julian@elischer.org> To: Bruce Evans <bde@zeta.org.au> Cc: John Baldwin <jhb@FreeBSD.ORG>, Leif Neland <leifn@neland.dk>, freebsd-current@FreeBSD.ORG, Gary Jennejohn <garyj@jennejohn.org> Subject: Re: make kernel failure: pecoff: machine/lock.h Message-ID: <3A9CF800.F633256B@elischer.org> References: <Pine.BSF.4.21.0102282234160.2593-100000@besplex.bde.org>
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Bruce Evans wrote:
>
> On Tue, 27 Feb 2001, Julian Elischer wrote:
>
> > Bruce Evans wrote:
> > > Most of the pcb actually has the same persistence as the kernel stack
> > > (both mainly store the process's context while the process is in the
> > > kernel). But it is silly to put the pcb below the stack instead of
> > > above it. Perhaps the idea is to get a panic sooner when something
> > > is corrupted.
> >
> > I have never understood why the context is not ON the stack.
>
> At least on i386's, it is because the context is not all saved in LIFO
> order. The pcb gets the non-LIFO stuff. E.g., the FP state is saved
> lazily, not pushed on every entry to the kernel.
We could push the pcb onto the stack as easily as have it somewhere else.
It's not compulsory to access stack memeory in sequential order.
>
> Bruce
>
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